WATCH ONLINE, MOBILE, FREEVIEW 63, SKY 164, FREESAT 162 AND VIRGIN 216
Himmler's Haunted Castle: Experts reveal the truth about the Nazi leader's Wewelsburg castle. Why did he want to keep it out of American hands? And what was his secret plan? (S1, ep 1)
Hitler's Meth Heads: Sam and RJ investigate whether crystal meth was the secret behind the Nazis' astonishing victory at Belgium's seemingly-impregnable Fort Eben-Emael. (S1, ep 2)
Secret Art Fortress: A British officer makes a shocking find: at a 900-year-old castle near the front line lies a vast collection of priceless artworks. (S1, ep 3)
Crocodile Massacre: Desperate for an escape to the mainland, 1,000 men at the Burma Front take to crocodile infested waters and perish at the jaws of the hungry beasts. (S1, ep 5)
Hitler's Lost Gold: Rumours swirl throughout Europe that Nazi trains of gold looted from innocent people and Nazi-occupied state banks were lost while crossing the continent. (S1, ep 6)
Secret Fleabomb: As troops mobilised following Pearl Harbor, America was gripped by fear. Meanwhile, Japan had a weapon that could turn their nightmare into a reality. (S1, ep 4)